ci: run the artifact workflow on push to main

[kjgbot]

Nothing verifies main

cloud-runtime-artifact.yml triggered only on pull_request and workflow_dispatch; review-swarm.yml only on pull_request. So every PR is checked at its own head and never as merged — and since we squash-merge onto a main that has moved since that CI ran, the composed result goes unverified.

Not theoretical

Twelve PRs merged on 2026-09-05, all in interacting areas — the exactly-once claim path (#171, #182), resume adoption (#177, #186), the authored-flow executor (#184, #187), the CLI run loop (#180). Each green on its own branch. The composed tree was never run until I dispatched it by hand tonight:

run 33987924703  workflow_dispatch  main  completed/success  ed917bfd

Main is fine. But nobody knew that, and finding out required knowing to ask.

Why it is worth a trigger rather than a habit

Without this, a bad compose surfaces as an unrelated PR going red — the most expensive way to find it, because the author debugs their own change first, then the base, then eventually the merge that broke it.

Tonight produced three separate cases of a failure on one PR belonging to something else entirely (#179, #185, and the #174 chain), and each cost a tick to attribute. Those were all pre-existing rather than compose failures, but they are the same debugging shape.

Note on paths

Deliberately not filtered on the push trigger. On a PR the question is "does this change affect the runtime". On main it is "is the tree good" — and a docs-only merge can still land on a tree someone else broke.

🤖 Generated with Claude Code

https://claude.ai/code/session_01FtQSAcGDta5VH9xiZFT4sR

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Reviewing files that changed from the base of the PR and between ed917bf and d1cb32a.

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• .github/workflows/cloud-runtime-artifact.yml

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